Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f3803e9a559659…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 12:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17d280a31af6d9af02a354dd9b1e7c1d SHA-1: a93b848f12cd5a4252fb5debbc24d69b887e64a1 SHA-256: 26f3803e9a559659ac6a084eabc40d1de118124564b9031271ef518040d85665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=lulubox+free+fire+app PDF link annotation
    • http://standardamulet.com/files/files/kutexutajokiwirali.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/kevuwasogobakurudizufim.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/41901038329.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad30ca958---zudodilu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613beeb371e7e---xepavudoxivodoli.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/99864689238.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/momapopuwuterikugema.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/84654568758.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/47050339235.pdfIn PDF document text
    • https://olterus.info/contents/files/zuziges.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/97450624937.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/91028570595.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/49644536199.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/wetazetojifoxukelamo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d3129e03999d425d127d47a2feed706d/taxotukawarojixu.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/vigewepanozivogup.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4decb5474f0a8ba472c46e2b3fffd7ba/buvudirezisemisa.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/fofinurojafivumudo.pdfIn PDF document text
    • http://gdgom.com/upload/file/210908200639994225orx1dg3h0th8.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/xaxufumuxezuseji.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/73282553945.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/30124697314.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/viruj.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/zuzib.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/xefokojitiwat.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 17192 bytes
SHA-256: d0d3ed7abab11cee2963c0190136106c610c7f1f84a4b14e28345d8174ead3db
font_01_sfnt_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 10280 bytes
SHA-256: 2ca5d9f24056d05a0bd6bed83b7a06546a25c92a3c9ff2bbf3a7b2b7878ea753
font_02_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1